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2 Sheets-Sheet 1.

(No Model.)

H. SWAIN.

HAND 300K DRILL.

No. 307,733. Patented Nov. 4, 1884..

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(No Model.) 2 Sheets-Sheet 2.

H. SWAIN.

HAND ROGK DRILL.

. Nn. 307,733. Patented Nov. 4, 1334.

Unitarian Starts Partnr Ottica HADVEN S'VAIN, OE DENVER, ASSGNOR TO JOHN A. FARROW, JOHN VAN EVERA, AND ROBERT M. MCDERMOTT, OF LEADVILLE, COLO.

HAND ROCKHDRILL.

SPE61E'I ..A'l"i0l`\l'` forming part of Letters Patent No. 307,733, dated November 4, 1884.

Application filed January 17, 1884. (No model.)

T0 @ZZ whom, it may concern/.-

Be it known that l, Hanwnn Swain, a citizen of the United States, residing at Denver, in the county of Arapahoe and State of Colorado, have invented certain new and useful Improvements in Hand Rock-Drills, of which the following isa specification, reference being had therein to the accompanying drawings.

My invention relates to improvements in hand rock-drills, and of that class of drills in which the drill is struck blow after blow by a spring-actuated hammer, said hammer being forced back by means of devices which will be more fully described hereinafter, then suddenly released, the blow of the'hammer being graduated in accordance with the tension of the spring.

Figure l is aside elevation of my improved drill. Fig. 2 is atop view. Figs. 3, 4, 6, 7, 8, 9, and l0 are detached views of portions of the drill. Fig. 5 is also a top view with portions ofthe operating mechanism removed.

A B C indicate the frame-work of the machine, and consists of metal tubes joined at the ends by the bent or elbow sections D D, and at the upper front corner by the T joint or coupling E.

F is a slide or frame through which the tubesectionB passes while one end of the slide F partly encircles the tubesection A. The slide or frame F carries the tube-section J parallel with the tubes A Rand also carries the drillspindle K. The slide or frame F is provided with an aperture, through which the screwrod S passes, the ends of said screw-rod S being seated in the bearings or sockets c c, and in which itis free to revolve. The lower side ot' the tube A is slotted longitudinally, as shown in Fig. 3, to allow the bolt I to slip backward and forward in said slot. 'The head or" the bolt I consists ci' a round piece of metal or other suitable material fitted snugly to the inside of the tube-section A. (See dotted lines in Fig. 5.) The bolt I passes through the sleeve G, coupling-sleeve H, and is provided with alever-nut, L, by which means the sleeve G and coupling H are held rigidly in position.

The couplingsleeve H is designed to hold the' ordinary drill-standard H', and is split, so that when the nut L is tightened to hold the parts to the section A the sleeve H will be firmly clamped on the drillstandard, H,a set-screw, H, being used to hold -the standard H more firmly in position. The tube-section J is provided at its front end with the elbow M, toY which the `hammer-operating mechanism is pivoted, as will more fully appear, while to the other end of the tubesection J is secured the hammer-support N, to which is pivoted the hammer-handle T. The elbow M is provided with a stud, O, to which the bifurcated bar P is pivoted, which, with the bars R and R pivoted thereto, form the toggle-levers which operate the hammer V.

Q'is a bar, the upper end ot' which is pivoted-to the joint which connects the bifurcated bar P with the bar R, the lower end of the bar Q being connected to the end of the pivoted bar V. The liar V is supported on the stud l, secured to the frame F,and its rear end, 2, is adapted to receive the end of the operating-lever NV, which can be swung back and forth at any angle. The ends of the bars R and R are slotted to receive the stud 3, by

which they are held and guided in their movenient rearward to push back the hammer.

The devices for voperating the hammer inl connection with the toggle-levers R and R' are as follows:

In a slot in the hammer-handle T is pivoted at 5 the `catch or latch et, while a slot and pin, 6, prevents the latch 4 from swinging too far. The hand-lever lV being moved up and down, the free ends of the levers R and R arethrust backward and forward alternately. The ends of said levers in their backward movement, coming in contact with the catch 4, push the hamw mer backward. `Vhen the levers R or R in their backward movement become nearly straight with the bar l?, the ends of said levers slip orf alternately either up or down from the catch 4, and the head of the hammer is thrust forward onto the head of the drill by the force of the spring S.

7 7 are inclines or beveled portions, formed on the ends of the levers R and R, eachof which forces the catch 4 through the slot ready to be operated upon by the other lever in its backwardimovement.

g is a split coupling supported by the drillspindle K, the halves or sections being adapted to hold the drill-point I. 'The drill-spindle K,

IOO

is supported in the frame F, and is free to be vmoved back land forth therein, so that when the bolt 19 is loosened and the drill-spindle drawn backward from the drill-point the said drill-point can be removed from the hole it has made in the rock without changing the postion of the machine, so that drill-points of varying sizes can be interchanged to meet the requirements of the work.

The drill is slightly lifted from the hole which it has formed in the rock, and'partiall y turned so as to strike in another place, by means ofthe following devices: The bars 11 and 12 are pivoted together so as 'to form toggle-levers, the outer ends of which are pivoted to the frame F, while their inner ends are connected to the upper end of arm 13, which in turn is connected at its lower end to the toggle-lever R by means of a slotted connection, and by which means the toggles 11 and 12 are operated. The outer end of the toggle-lever 12 is connected tothe frame F by means of a bolt working in a slot, z", thus enabling` said lever to work back and forth, the end of which, coming in contact with the head of the drillspindle, forces it, together with the drill, backward and frees the drill-point from the bottom of the hole. The toggles 11 and 12 having been forced past the center,or beyond a straight line passing through said toggles, the drill and drill-spindle are drawn forwardlby the tension of the spring 1S acting on the arm or lever 14, pulling it downward until the point of the drill rests on the bottom of the hole which is being made.

The devices for turning the drill. are arranged as follows: 14 is an arm or lever, one end of which is pivoted to the frame F at 16, while the other end of said lever is turned upward to form an arm, 7.a', which impinges against the side nearest the hammer of the ratchet-wheel Z on the end of the coupling g. The arm or lever 14 is provided with a pawl, 15, which engages with the teeth of the ratchet-wheel Z, while the free end of said arm is secured to the elbow M of the frame by the spring 18. It will be noticed Jthat when the drill and drill-spindle are forced backward by the toggle-levers 11 and 12, the pressure exerted on the arm cby the impingement ofthe sleeve g and ratchet Z tends to raise the inner or free end of the lever 14 and cause the pawl 15 to engage with an upper tooth of the ratchet Z. W'hen the pressure of the toggles 11 and 12 is released from the head of the drillspindle, the force of the spring 18 tends to pull down the free end of the lever 14, and thus turn the dri ll-point and drill-spindle part way around. The lever 14 is also provided with a pawl, 17, which engages with a'ratchet, 20,

secured to the screwshaft S by means of a spline running the entire length of the shaft S, into which spline a projecting lug on the ratchet engages. The ratchet 2() projects through a slot or opening formed in the frame F, so as to admit of the pawl coming in con-` tact therewith. APlaced in the same opening in the frame F is the half-nut 21,which is screwthreaded on its under side and made to conform to the shaft S. The nut 21 is secured to the bar a, one end of which is pivoted to the frame F,while the other or free end of the bar a is adapted to be locked in position by the pivoted piece or button 22. NVhen the bar a is released and the nut 21 swung back, the frame F can be slid back, withdrawing the drill fromV the drill-hole and ready for operation in drilling a new hole. The upward movement of the lever 14 turns the ratchet 2O and screw-shaft S, thus moving the frame F,

together with the drill and drill-spindle, forward to the work, while the downward movement of the outer'end of said lever 14, by means of the pawl 15 and ratchet l', turns the drill in the hole just before the blow is given.

The levers R and R', in shoving the hammer back, have a motion upward and downward, which moves the rod 13. This in turn operates the toggles 11 and 12. The latter having passed a straight line, the pressure of the spring 18 on the outer end of the arm 14 pulls it down and moves the drill slightly forward, and causes it to complete its stroke by the means of the slack allowed by the slot in the rod 13. Thus the drill is placed against the rock before the hammer strikes K. VThe arm 14, being hung back of and below g, is given an upward and downward movement by the backward and forward movement of the sleeve g, in which the drill and drill-spin dle are secured, which ,makes the pawl 15 operate g and turn the drill and the pawl 17 to operate 20, which turns the screw, thus feeding the drill ahead. Should the drill be held back by the rock, it in turn holds 14 backward` and upward, which prevents the pawl 17 from dropping into the tooth in 20, so that the drill does not feed ahead. The pipe 23 slips into the inside of B, and has a line of holes through which the pin 26 passes. In the end 23 is a screw, 24. This screw is pointed, to be put against the rock to steady the drill. Clamped to 23 is the arm 25, which passes round the drill, and is for the purpose of steadying the latter when the hole is started.

Having thus described my invention,what I claim, and desire to secure by Letters Patent,

1. ln a rock-drilling machine, the pivoted lever 14, provided with arm k', pawl 15, and spring 18, in combination with the toggles 11 and 12, drill-spindle K, and mechanism, sub` stantially such as described, for operating said toggle-levers, as set forth.

2. In a rock drilling machine, the bifureated lever I), having the toggle-levers R R pivoted thereto, and operated by the bars Q V, and leverV, in combination with the spring actuated hammer-handle T, provided with the swinging latch, against which the toggle-levers bear, as and for the purpose set forth.

3. In a rock-drilling machine, the toggle- LUL) IIO

described, for operating said levers, `\vliereby the hammer is thrust back and suddenly released to strike the blow on the drill-spindle, as set forth. 1 5

In testimony whereof I afx my signature in A presence of two witnesses.

HADWEN sWAIN.

Witnesses:

HARVEY XV., YONLE Y, WILLIAM J. HARvnY. 

